• d-bugmail puremagic.com (46/49) Jun 27 2013 http://d.puremagic.com/issues/show_bug.cgi?id=10489
• d-bugmail puremagic.com (12/12) Jun 29 2013 http://d.puremagic.com/issues/show_bug.cgi?id=10489

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=10489

           Summary: Orphan format arguments exception/error for writeln
                    unless they are
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



In DMD 2.064alpha this program compiles and runs with no errors, warnings or
run-time exceptions:

import std.stdio;
void main() {
    writefln("%d %d", 1, 2, 3);
}



While this gives a run-time exception:

import std.string;
void main() {
    format("%d %d", 1, 2, 3);
}


std.format.FormatException ...\dmd2\src\phobos\std\string.d(2346): Orphan
format arguments: args[2..3]


To catch some programmer mistakes I suggest to turn this into an
exception/error:

writefln("%d %d", 1, 2, 3);


But as stated by Andrei Alexandrescu:
http://forum.dlang.org/post/kqgna8$1ese$1 digitalmars.com

 The only point I'd negotiate would be to not throw with positional 
 arguments, and throw with sequential arguments. All code that cares uses 
 positional specifiers anyway.

So according to Andrei this should be accepted:


import std.stdio;
void main() {
    writefln("%2$s %1$s", 1, 2, 3);
}


Currently this is accepted (and it prints "A B10"), but I think it should be
not accepted:

import std.stdio;
void main() {
    writefln("A%2$s B%1$s", 10);
}

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=10489


Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich gmail.com
         Resolution|                            |DUPLICATE



20:05:48 PDT ---
*** This issue has been marked as a duplicate of issue 4927 ***

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